Be vary careful when using PHP's
empty() function. Some code that I came across recently handled configuration of something where each config option was a record in the database. Upon saving, the fields of the form were iterated over and 'empty' fields were ignored and not saved.
However, when a value was 0 it was treated as empty and, therefore, not saved. In this context 0 was meaningful but PHP treated it as empty and ignored it. A better way to handle empty values in that context would have been to simply check for the specific empty string with
The PHP reference for
empty() is the opposite of (boolean) var
So when you think you need to use
empty() ask yourself what you are really checking. Chances are, you don't want to use